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R. G. FOWLER.

Burglar Alarm.

No. 60,711. I Patented Jan. 1, 1867.

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IMPROVED BURGLAR ALARM.

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TO ALL WHOM IT MAY CONCERN:

Be it known thatI, ROBERT G. FOWLER, of Olney, in the county of Richland, and State of Illinois, have invented a new and improved Burglar Alarm; and I do hereby declare the following to be a full, clear, and exact description of the same, suicient to enable others skilled in the art to which my invention appertains to make and use`the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 is a perspective view of the device.

Figure 2 is a verticalsectional view, the device in position.

Figure 3 is a horizontal section.

The device is adapted to'be fastened to the door-casing or jamb, and to be sprung, and a cap discharged by the opening of the door, window, or idrawer in whose vicinity it is attached. l i 4 The screw by which it is fastenedA to the jamb or` other object, is a continuation of the mandrel around which the spring is wound, and the hammer upon -whose end the cap is xed, is a continuation of the spring wire,

vwhose detent, when set, is a notch in the casing. In the drawings- A isa clase, having within it a mandrel or pin, B, around which a wire, O, is coiled. The pin, B, being prolonged, forms on the outside a screw, o, by which the burglar alarm may be attached to the casing or jamb of the door, the Window, or the drawer whose opening it is desired shall bieannounced. I consider it preferable that the end of the mandrel shall thus form the means of attachment of the device, though it will readily occur` toany person familiar with mechanics that it may be attached by a separate screw or screws. The wire, O, is coiled around the mandrel, B, and theextended end, d, is bent over and has an enlargement, k, adapted to receive a. percussion cap, m. The wire is so wound as to have a power in the direction of the arrow, when the extended portion, d, which forms the arm or hammer, is retracted backward and caught within the notch, a, in the end of the casing; it is then set, and being fastened in position, -it projects, as seen in fig. 3, so that the opening door will strike against it and push itiout of its notch, when it rapidly revolves and explodes the against the plate, n, givi'ngthe requiredalarm Y This device, weighing under two ounces, may be readily carried in the pocket by travellers and attached to their room doors, or used in other situations, to guard drawers, tills, or windows, fastened to a stationary portion in such a way as to expose the hammer when set to the contact of the opening door,.&c., and may be so attached, if required, that the casing may be rotated to bring the hammer out of range of the door when it is desired to leave the room without detaching the alarmor unsetting it.

Having described my invention, what I claim therein as new, and desire to secure by Letters Patent, is

The 'arrangement of the wire -C mandrel B, notched casing A a, substantially as described and represented.

ROBT. G. FOWLER.

Witnesses z.

` SoLoN C. KEMON,

EDWARD H. KNIGHT. 

